Chapter2_SyntaxB_Ex9

import java.util.Scanner;

/*  ==================================================
          Chapter 2: Syntax section B- Loops

            Ex9: Subsequent letters
    ===================================================
*/

public class MyProgram {
    public static void main(String[] args) {

        //variables
        char prev,letter;
        int counter=0;
        Scanner s=new Scanner(System.in);


        System.out.println("Enter letters: ");
        prev=s.next().charAt(0);

        //loop until 3 Subsequent letters input
        while(counter<2){   //if counter reaches 2- we found 3 letters

            letter=s.next().charAt(0);
            //if letters are Subsequent increase counter, if not reset counter
            if(prev==letter-1)
                counter++;
            else{
                counter=0;
            }
            prev=letter;    //continue the search with the last input (get rid of the first letter)

        }

        System.out.println("you've entered 3 Subsequent letters!\n*** End ***");
    }
}